admin: moved users controller into admin namespace
admin: added attendees controller
admin: attendees edit
admin: updated attendees path
added admin courses route, fixed existing admin routes
added admin submissions route
created admin comments controller
created admin contents controller
admin contents controller: new action
added edit and destroy methods to admin courses controller
moved course mentors controller into admin
payments and discount codes into admin
merged with master
edit attendee path
Merge branch 'master' into admin
admin controllers: fixed conflicts, added in latest changes from master
Merge branch 'master' into admin
admin: moved attendee partial into admin
attendees controller: adding create method back in
Merge branch 'master' into admin